154 
PRODUCTUS longispinus. 
TAB. LXVIU.—fig. 1. 
Spec. Cuar. Eared; convex valve indented in the 
middle, broader than long, the other concave ; 
hinge long, one very long and several smaller 
spines near each side of the concave valve. 
a 
Tue ears are triangular, gradually extended from the sides 
of the shell, and bounded at the back by the straight linear 
hinge, which is about half as long again as the shell, and 
equal to its width. All the spines are tubular, the two 
principal ones are nearly straight and cylindrical, attached 
to the sides of the convex valve, and extending in a line 
parallel to the hinge, the other spines are placed between 
these and the beak; in the only specimen I have examined 
there are two small holes near the front edge, probably the 
remains of spines which have been broken off. The reflexed 
margin is entirely lost, but the great curve of the concave 
valve and the blunt edge indicate it, Length half an inch. 
I name this from its remarkable spines, of the extent of 
which when perfect I am not certain; they diminish but 
little in half an inch, so that to come to a point they would 
be perhaps an inch and an half long; they are apparently 
broken, which shows their tubular construction, and from 
what I have seen in other species, I should guess that they 
open into the shell for some purpose suited to the nature of 
its inhabitant. ‘It is from the great Limestone stratum 
which traverses in a northerly direction the county of 
Linlithgow, and constitutes a part of the independent Coal 
formation of the Lothians, Scotland;” Rev. J. Fleming. 
